You've heard of varicose veins — those swollen veins that sometimes show up in the legs. You've probably heard your grandma and her old lady friends talking about their varicose veins and never thought twice about them.But hopefully you've never heard your grandma mention a varicocele, which is also a swelling of the veins. A varicocele happens just to guys, and you probably won't sit around and talk about it with your pals. That's because...